Dresden 2006 – scientific programme
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MA: Magnetismus
MA 27: Spin-Dynamics, Magnetization Reversal II
MA 27.3: Talk
Thursday, March 30, 2006, 10:45–11:00, HSZ 403
Spin-Wave Eigenmodes of Landau-Domain Patterns — •Markus Bolte1, Guido Meier1, and Christian Bayer2 — 1University of Hamburg, Institute of Applied Physics, Jungiusstr. 11, 20355 Hamburg, Germany — 2Fachbereich Physik und Schwerpunktprogramm MINAS,Technische Universität Kaiserslautern, Erwin-Schrödinger-Straße 56, 67663 Kaiserslautern, Germany
We present micromagnetic simulations of the spin-wave spectra in Landau-domain patterns. Ultra-short field pulses of various spatial symmetries are used to excite distinct spin-wave eigenmodes. The frequencies as well as the symmetry of the mode patterns depend on the symmetry of the exciting torque. The latter is determined by the symmetries of the field pulse and the magnetic ground state. Landau-domain patterns have collective excitations, i.e., the spin-wave modes cannot be considered for each domain individually. We find transversal modes as well as longitudinal modes as observed experimentally.[1,2] From the mode profiles an effective dispersion relation is deduced which resembles the dispersion relation for infinitely extended thin films.[3]
[1] K. Perzlmaier, et al., Phys. Rev. Lett. 94, 057202 (2005). [2] M. Bolte, G. Meier, and C. Bayer, submitted (2005). [3] B. A. Kalinikos, A. N. Slavin, J. Phys. C 19, 7013 (1986).